Hi Peeples

my younger brother has been using Kindles and Kobos for a long time now and I would ask him this question but he's in the Arctic camping so definitely no wifi lol.
My brother has a library on his HDD with pdf mobi and epub files that he's bought over the years. I'd like to buy my own e-reader and transfer those files to my device to read them. Is this a normal function of an e-reader? Is there restrictions that you can only read from books you have purchased? Is it as easy as an ipad where you access file and upload to inbuilt library function? normally tech savvy but currently a e-reader virgin. Help would be appreciated